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<title>Cea mai &quot;neagrÄƒ&quot; planetÄƒ: Astronomii au
	descoperit o lume atÃ¢t de Ã®ntunecatÄƒ Ã®ncÃ¢t ar face cÄƒrbunele sÄƒ
	parÄƒ strÄƒlucitor</title>
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					<span><a href="/stiinta-sanatate/"
						title="ÅžtiinÅ£Äƒ-SÄƒnÄƒtate">ÅžTIINÅ£Äƒ-SÄƒNÄƒTATE</a></span> 12 aug
					2011
				</p>
				<div class="main_title">Cea mai "neagrÄƒ" planetÄƒ: Astronomii
					au descoperit o lume atÃ¢t de Ã®ntunecatÄƒ Ã®ncÃ¢t ar face
					cÄƒrbunele sÄƒ parÄƒ strÄƒlucitor</div>
				<a class="main_thumb" href="#"
					title="Cea mai &quot;neagrÄƒ&quot; planetÄƒ: Astronomii au descoperit o lume atÃ¢t de Ã®ntunecatÄƒ Ã®ncÃ¢t ar face cÄƒrbunele sÄƒ parÄƒ strÄƒlucitor">
					<img
					src="http://storage0.dms.mpinteractiv.ro/media/1/1/7627/8608216/1/exoplaneta-intunecata-afp.jpg?width=310"
					alt="Cea mai &quot;neagrÄƒ&quot; planetÄƒ: Astronomii au descoperit o lume atÃ¢t de Ã®ntunecatÄƒ Ã®ncÃ¢t ar face cÄƒrbunele sÄƒ parÄƒ strÄƒlucitor" />
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					<p>Astronomii au descoperit cea mai Ã®ntunecatÄƒ exoplanetÄƒ
						cunoscutÄƒ pÃ¢nÄƒ acum, o giganticÄƒ gazoasÄƒ de mÄƒrimea lui
						Jupiter, numitÄƒ TrES-2b. MÄƒsurÄƒtorile au arÄƒtat cÄƒ planeta
						reflectÄƒ mai puÅ£in de un procent din lumina primitÄƒ de la
						steaua ei, potrivit unui studiu publicat de Royal Astronomical
						Society (RAS) din Marea Britanie.</p>
					<p>ÃŽn sistemul nostru solar, Jupiter este Ã®nfÄƒÅŸurat Ã®n
						nori strÄƒlucitori de amoniac care reflectÄƒ mai mult de o treime
						din lumina solarÄƒ. ÃŽn contrast, TrES-2b, care a fost
						descoperitÄƒ Ã®n 2006 de Trans-Atlantic Exoplanet Survey (TrES),
						este lipsitÄƒ de nori care sÄƒ reflecte lumina din cauza
						temperaturii foarte ridicate.</p>
					<p>Exoplaneta este pe o orbitÄƒ foarte apropiatÄƒ de steaua sa,
						la o distanÅ£Äƒ de 5 milioane de kilometri. Lumina intensÄƒ a
						stelei loveÅŸte planeta TrES-2b cu o temperaturÄƒ mai mare de 1000
						de grade Celsius, mult prea fierbinte pentru norii de amoniac.</p>
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					<p>
						<strong>Atmosfera exoticei planete conÅ£ine substanÅ£e
							chimice care absorb lumina, precum vaporii de sodiu ÅŸi potasiu
							sau oxid de titan gazos</strong>.Cu toate acestea niciuna dintre aceste
						substanÅ£e chimice nu explicÄƒ "Ã®ntunericul" exoplanetei.
					</p>
					<p>"TrES-2b are o putere de reflexie considerabil mai scÄƒzutÄƒ
						decÃ¢t vopseaua acrilicÄƒ cea mai neagrÄƒ, deci este vorba de o
						lume cu adevÄƒrat necunoscutÄƒ", a spus David Kipping, de la
						Centrul de AstrofizicÄƒ Harvard-Smithsonian, Ã®ntr-un comunicat al
						Royal Astronomical Society.</p>
					<p>Astronomii au determinat reflectivitatea planetei TrES-2b
						folosind telescopul spaÅ£ial Kepler, care este proiectat sÄƒ
						mÄƒsoare strÄƒlucirea stelelor Ã®ndepÄƒrtate cu mare precizie.</p>
					<p>Echipa care a monitorizat exoplaneta a ajuns la concluzia
						cÄƒ orbita TrES-2b este de acelaÅŸi tip cu al Lunei noastre,
						avÃ¢nd faze Ã®ntocmai ca ÅŸi satelitul PÄƒmÃ¢ntului ÅŸi
						Ã®ndreptÃ¢nd spre steaua centralÄƒ aceeaÅŸi parte, Ã®ntotdeauna.</p>
					<p>Exoplaneta TrES-2b, care orbiteazÄƒ Ã®n jurul stelei GSC
						03549-02811, este situatÄƒ la aproximativ 750 de ani luminÄƒ, Ã®n
						direcÅ£ia constelaÅ£iei Dragonului.</p>
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